On Mon, Aug 28, 2006 at 10:51:00AM +0100, Jan Beulich wrote:
> >>> Andi Kleen <[email protected]> 27.08.06 20:19 >>>
> >On Sunday 27 August 2006 19:20, Jeremy Fitzhardinge wrote:
> >> Andi Kleen wrote:
> >> >> +1: movw GS(%esp), %gs
> >> >>
> >> >
> >> > movl is recommended in 32bit mode
> >> >
> >>
> >> arch/i386/kernel/entry.S: Assembler messages:
> >> arch/i386/kernel/entry.S:334: Error: suffix or operands invalid for `mov'
> >
> >Looks like a gas bug to me.
>
> This was an intentional change (by H.J. if I recall right) as using movl
> with segment registers gives the incorrect impression that one gets a
> 32-bit memory access (especially for stores this is important, since
> there's really nothing stored to the upper 16 bits). One should always
> use suffix-less 'mov' for segment register accesses.
mov will generate the optimal opcode with old and new assemblers.
H.J.
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